Quantum physics just solved one of the great paradoxes of time travel

The fuzziness of quantum physics causes a lot of problems, from maliciously changing time-of-flight calculations between satellites to mucking up Newton’s beautiful, all-seeing physical models of the universe. Yet, when it comes to topics as airy as the New Physics, incorporating genuinely insane ideas like negative mass and, yes, time travel, that very fuzziness can become a boon to researchers. Within the open and unknowable possibility space provided by the behavior of quantum particles, we can shovel in all manner of poorly understood concepts and phenomena, and that might not actually be such an irresponsible thing to do. By taking quantum mechanics into account, some physicists think they may have solved one of the oldest puzzles in the history of abstract physical thinking: the grandfather paradox.

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